Arc-Extinguishing Apparatus

This application is a national stage entry of International Patent Application No. PCT/CN2024/102274, filed on Jun. 28, 2024, and claims priority of Chinese Patent Application No. 2023107839257, filed on Jun. 29, 2023, Chinese Patent Application No. 2023109418981, filed on Jul. 28, 2023, and Chinese Patent Application No. 2024108533258, filed on Jun. 28, 2024, all of which are incorporated herein by reference in their entireties.

The present disclosure relates to an arc-extinguishing apparatus, and in particular to an arc-extinguishing apparatus suitable for the arc extinguishing of a switch of a bridging (connection) structure with high cost-effectiveness, simple circuitry, good arc-extinguishing performance and high reliability.

DC scenarios are increasingly common. However, DC arc extinguishing has been a challenge.

The object of the present disclosure is to solve the problems described in the background art and to provide an arc-extinguishing apparatus which has the advantages of high cost-effectiveness, simple circuitry, good arc-extinguishing performance, high reliability, and is suitable for a bridging structure switch.

The object of the present disclosure is achieved by the following technical solutions:

1 FIG. 1 2 1 1 1 2 1 3 1 2 1 2 1 1 1 3 2 3 2 1 As shown in, an arc-extinguishing apparatus includes a first device QA. The main loop electrodes of the first device QA include a first electrodeand a second electrode. The switch Sto be arc-extinguished includes a first end N(that is, the node where the first static contact of the switch Sis located), a second end N(that is, the node where the second static contact of the switch Sis located), and a contact bridge N. The first electrodeand the second electrodeare respectively configured to connect to the first end Nand the second end N. The apparatus also includes a capacitor Cand a first voltage detection switch VT. The first voltage detection switch VT, the third electrodeof the first device QA, and the second electrodeform a first series circuit. The contact bridge Nand the second end Nform a second series circuit. The first series circuit is connected in parallel with the second series circuit, and the capacitor Cis connected in parallel with the second series circuit.

1 FIG. 3 2 3 2 1 1 1 1 1 1 2 1 Working principle: As shown in, when the contact bridge Nis disconnected from the second end N, the potential difference between the contact bridge Nand the second end Nquickly charges the capacitor C(which can also realize arc extinguishing for the second series circuit). When the voltage of the capacitor C(the second series circuit) (the voltage between the contact bridge and the third electrode) reaches the turn-on voltage of the first voltage detection switch VT, the first voltage detection switch VTis turned on, and the voltage of the capacitor Cdrives the first device QA to be turned on, thereby realizing arc extinguishing between the first end Nand the second end N. Then, the capacitor Ccannot obtain a continuous charging power source, and the first device QA is turned off to complete the working process.

The present disclosure has the advantages of rational design, high cost-effectiveness, simple circuitry, good arc-extinguishing performance and high reliability.

Embodiment of the present disclosure:

2 FIG. 4 FIG. 5 FIG. 1 2 1 1 2 1 2 1 1 2 3 1 2 1 2 1 1 1 3 2 3 2 1 1 1 3 1 1 2 2 2 1 2 1 2 1 2 3 2 As shown in, an arc-extinguishing apparatus includes a first device QA (a fully controlled device, preferably a field-effect transistor or an IGBT). The main loop electrodes of the first device QA include a first electrode(drain, or collector) and a second electrode(source, or emitter), a capacitor C, a first resistor R, a second resistor R, a first voltage detection switch VT, a second voltage detection switch VT, and a voltage-limiting device RV (Zener device). The switch Sto be arc-extinguished includes a first end N, a second end N, and a contact bridge N. The first electrodeand the second electrodeare respectively configured to connect to the first end Nand the second end N. The switch Sis a bridging structure (two single-break switches can be connected in series to form a bridging structure switch). The first resistor R, the first voltage detection switch VT, the third electrode(gate) of the first device QA, and the second electrodeform a first series circuit. The contact bridge Nand the second end Nform a second series circuit. The first series circuit is connected in parallel with the second series circuit, and the capacitor Cand the voltage-limiting device RV are connected in parallel with the second series circuit; the first voltage detection switch VTis configured to detect the voltage of the capacitor (the second series circuit, between the third electrode and the capacitor Cor the contact bridge N). The first voltage detection switch VTis configured to turn on when the voltage of the capacitor Cis greater than the voltage required to drive the first device QA to be saturated and conducted; the second voltage detection switch VT(as shown in, composed of a resistor, a capacitor, a transistor, a diode, and a Zener device or other similar circuits can be used) is connected to the first series circuit. The second voltage detection switch VTis configured to turn on when the detected voltage is less than the designed value of the second voltage detection switch VT, to discharge the capacitor C. The turn-on voltage of the second voltage detection switch VTis less than the turn-on voltage of the first voltage detection switch VT(as shown in, which is a schematic diagram of the driving voltage waveform between the third electrode and the second electrode); the second voltage detection switch VTis a time-delay switch; the turn-on voltage of the first voltage detection switch VTis greater than the voltage required to drive the first device QA to be saturated and conducted; the second electrode, the third electrodeand the second resistor Rare connected in parallel.

1 1 1 2 1 2 2 1 1 1 1 2 3 4 1 2 1 3 FIG. 2 FIG. The first voltage detection switch VTis a semi-controlled switch (trigger switch), which is composed of a first voltage-stabilizing device Z(used for adjusting the turn-on voltage) and a semi-controlled semiconductor switch (preferably a thyristor equivalent circuit composed of transistors, which can be replaced by a thyristor). The semi-controlled semiconductor switch includes a first transistor Q(N-type) and a second transistor Q(P-type). The base of the first transistor Qis connected to the collector of the second transistor Q. The base of the second transistor Qis connected to the collector of the first transistor Q. The two ends of the first voltage-stabilizing device Zare respectively connected to the emitter and collector of the first transistor Q(as shown in), or the two ends of the first voltage-stabilizing device Zare respectively connected to the emitter and collector of the second transistor Q(as shown in). The third resistor Rand the fourth resistor Rrespectively connected to the transistors Qand Qare configured to improve the stability of the circuit; the first voltage detection switch VTcan also be a trigger diode (and its equivalent electrical characteristic device, also defined as a semi-controlled switch), or other equivalent circuits.

3 2 3 1 3 2 1 1 1 1 1 2 1 1 2 1 2 Working principle: When the contact bridge Nis disconnected from N, the contact bridge Nquickly charges the capacitor Cto extinguish the arc of the second series circuit (that is, to extinguish the arc between Nand N). When the voltage of the capacitor Creaches the turn-on voltage of the first voltage detection switch VT, the first voltage detection switch VTis turned on, and the voltage of the capacitor Cdrives the first device QA to be saturated and conducted, thereby realizing arc extinguishing between the first end Nand the second end N. The first voltage detection switch VTis configured to turn on when the voltage of the capacitor Creaches the voltage required to drive the first device QA to be saturated and conducted; the second voltage detection switch VTis configured to turn on when the detected voltage provided by the capacitor Cis less than the designed value of the second voltage detection switch VT, thereby realizing the rapid turn-off of the first device QA.

6 FIG. The switch to be arc-extinguished can be a switch with a bridging structure formed by connecting two single-break switches (as shown in). The common node of the two single-break switches is also defined as a contact bridge.

3 1 The above embodiment can also be provided with a diode, and the contact bridge Ncharges the capacitor Cthrough the diode.

1 1 1 In the above embodiment, the voltage-limiting device RV can be a varistor, or a Zener diode, or a transient suppression diode, and related equivalent devices; the withstand voltage value (turn-on voltage) of the voltage-limiting device RV can be selected to be less than the system working voltage of the switch (for example, for a system working voltage of hundreds of volts, a voltage-limiting device with a turn-on voltage of 10 to 35 volts can be directly selected. The withstand voltage value of the voltage-limiting device RV is preferably less than the withstand voltage value between the third electrode and the second electrode). The withstand voltage values of the matching capacitor Cand the first voltage detection switch VTcan be selected to be less than the system working voltage of the switch S, which is conducive to greatly reducing the cost and volume of the arc-extinguishing apparatus of the present disclosure.

5 FIG. 1 2 1 2 1 2 2 1 In the above embodiment, as shown in, the values of VTand VTcan be adjusted by Zand Z. The pulse width of the pulse voltage driving QA can be flexibly adjusted by the relevant parameters of Z, Z, RI, R, C, and RV, which has the advantage of stable pulse signal.

In the above embodiment, when the first voltage detection switch adopts a voltage-controlled device (field-effect transistor, IGBT) to drive the IC, it integrates the second voltage detection switch (function), which has the advantage of smaller volume.

1 3 2 3 2 The present disclosure utilizes the rapid charging of the capacitor Cto realize arc extinguishing between Nand N, or to reduce the arc. The potential difference between Nand Nrises rapidly, which can further accelerate the charging speed of the capacitor. When the first voltage detection switch detects that the capacitor voltage meets the condition for driving the first device QA to be saturated and conducted, it drives the first device QA to be rapidly saturated and conducted. By utilizing the characteristic that the first voltage detection switch is a semi-controlled switch, the signal pulse width for driving the first device QA is met, and the circuit is prevented from oscillating, thereby reducing the risk of damage to the arc-extinguishing apparatus.

The present disclosure has the advantages of rational design, high cost performance, simple circuitry, good arc-extinguishing effect and high reliability.